fords4life Posted July 17, 2023 Author Share Posted July 17, 2023 Check with NAPA; they sell a straight 90w GL1 mineral oil that I've seen recommended for the "earlier" transmissions. I bought a gallon and filled my T18 up with it. I've only got 120 or so miles since the trans swap, but it shifts pretty well. Of course the unsynchronized 1st can grunt every so often when you shift into 1st, but I typically have been taking off in 2nd anyway. https://www.napaonline.com/en/p/NHF65201 This is what I ended up going with. https://a.co/d/g7ukfiV Glad I did though since the PTO cover is leaking. Not terrible, but enough that I'll have to drain it and redo it. I will try to pickup some Redline before I fix it, but funds were tight when I was in the midst of buying all the parts so went with what I could get locally for a decent price. Link to comment Share on other sites More sharing options...
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